Feed mechanism for stone-sawing machines.



No. 669,642. Patented mar. 12,, neon.

- s. n. HUNTER.

FEED MECHANISM FOR STONE SAWlNG MACHINES.

(Application filed Dec. 14, 1899.: (No Model.

1 Sheets-Shoal l.

No. 669,642'. Patented Mar. 12 19m.

6. n. HUNTER. run mEcHA'msM run smna SAWING MACHINES. (Application filedDec. 14, 1899.) (No hjodel.) 2 Sheets-Sheet 2.

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GEORGE D. HUNTER, OF BLOOMINGTON, INDIANA.

FEED MECHANISM FOR STONE-SAWING MACHINES.

SPECIFICATION forming part of Letters Patent No. 669,642, dated March12, 1901.

Application filed December 14, 1899. Serial No 740,307. (No model.)

To of whom it may concern:

Be it known that I, GEORGE D. HUNTER, a citizen of the UnitedStates,residing at Bloomington, in the county of Monroe and State ofIndiana,haveinvented certain new and useful Improvements in FeedMechanism for Stone- Sawing Machines; and Ido hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to an improvement in feed mechanism for gangstone-sawing machines, and is embodied in the construction andarrangement of. parts hereinafter described, and defined in the claims.

The invention relates more particularly to that class of machineswherein ratchet-andpawl mechanism is employed to feed sawgangs down tothe work gradually and by means actuated by the power driving mechanism.Heretofore it has been customary to connect the pawl-actuating meansdirectly with the ratchet-wheels and train of gearing by a rigidconnection, and it has been found that in the event of a stoppage of themovement of the feeding-screws, which often happens from various causes,that the continued movement of the pawl-actuating means results in thebreaking of some of the mechanism, usually the teeth on theratchet-wheels or cogs on the gear-wheel and in some cases the pawls. Myinvention is designed to overcome these objections; and it consists inproviding a yielding connection to the actuating parts of the feedingmechanism, whereby a continued actuation of the pawl-actuatinginstrumentality can be had or permitted without injury to the machine.

In the accompanying drawings I have shown an embodiment of theinvention, but desire it understood that various changes can be madewithout departing from the nature and principle of the invention.

In the drawings, Figure 1 is a side elevation of that portion of astone-sawing machine which is commonly termed the feed. Fig. 2 is anenlarged view of my device. Fig. 3 is an enlarged detail view of thepaWLandratchet mechanism and its associated parts, and Fig. 4 is aslight modification thereof.

As the invention relates wholly to the feeding mechanism it is notthought necessary to show any part or portion of the machine, as theconstruction is well known.

In the drawings, A represents a supporting beam or upright forming partof the machine. On this beam or upright are mounted the feed-screws B,the upper ends of which carry a miter-gear b; meshing with thecorresponding gear on the horizontal shaft b, carrying other gear-wheelsfor connections to the feedscrew B, also spin-wheel on to mesh withpinion-gear for feeding the saw-gangs down. Other gears are arranged forraising or lowering the saw-gangs; but as this has nothing to do with myinvention a description is unnecessary. The pinion-gear y by preferenceis made solid with the ratchet-wheel 4 and these two wheels as one aremounted on the ratchet-wheel lever y" to be thrown in or out of gearwhen desired by the lever F. All the above-described features are wellknown in the art.

Mounted on the ratchet-shaft is a lever G, carrying a pawl g, whichengages with the ratchet-wheel. This lever has an elongated slot gtherein, through which a suitable pin or bolt g passes and may besecured at any desired point. The pin g projects loosely through anopening in the bracket j, cast or secured to a sleeve or box H, whichlatter is formed with a longitudinal opening, through which theactuating-bar J passes. The bar J is connected at one end with theactuating mechanism, which is usually a crank dri y e n by suitablegearing and has a regulaF backward and forward movement. This construc-'tion is not shown, but is well known in the art. The rod J is formedwith a shoulder j, and the shoulder extends for a considerable distancebeyond the sleeve or casting H. On the projecting part of the rod J issleeved a coil-spring E one end abutting against the nut b He end of therod, while a the opposite end abuts against the end, of the sleeve orcasting H, the tension of the spring being varied by the nut. Inoperation the actuatingbar J is drawn back, carrying the sleeve H firmlyagainst the end of the spring, the tension of the latter being such thatthe lever G will move before the spring is wholly compressed. Themovement of the lever actuates the feeding mechanism and reversing themovement of the actuating-rod resets the lever and pawl for thesubsequent feed. Should the feeding train or screw be blocked in itsmovement, which is often the case, and the actuating-rod J continued inits movement, the full movement of the latter will be permitted by thecontinued compression of the spring K, the tension of the latter beingless than the resistance to the feed, so that the spring will therebyprevent the breaking of any of the parts.

In Fig. 4 I have shown the construction wherein the reverse movement isemployedthat is, the actuating-rod J acts to push the pawl-actuatinglever rather than pull it, a spring being arranged on the opposite side.

The special means can be altered and the same can be applied in variousways and in various connections without departing from the invention.

Having thus described the invention, what I claim as new, and desire tosecure by Letters Patent, is i 1. In a stone-sawing machine, the combination with the feeding mechanism, of a swinging lever G for actuatingthe same, a reciproeating rod J for operating the lever, means foradjustably connecting the lever G and rod J together to permitaslidingmovement of the latter, and a spring interposed between saidconnecting means and an abutment on the rod J, substantially asdescribed.

2. In a stone-sawing machine, the combination with the feeding mechanismfor the saws, of a ratchet-and-pawl mechanism for actuating the feed, areciprocating rod for actuating the pawl, and a yielding connectionbetween the rod and the pawl, substantially as described.

3. In a stone-sawing machine, the combination with the feeding mechanismfor the saws, comprising a pawl and ratchet, of a reciproeating rod, aspring on the rod and a sliding connection between the rod and pawlagainst which the spring abuts, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE D. HUNTER.

Witnesses:

J. W. OHARRoW, O. O. PORTER.

